Quick One! NTSC PAL

In case you were by some freak chance, wondering, NTSC stands for the National Television System Committee, and is the analog television system used in most of the US. NTSC uses 525 horizonal lines of which only 487 make up the active picture. It's an inferior video standard compared to PAL (Phase Alternating Line) which uses 625 horizontal lines, of which 576 are used for the picture. In other words, it has roughly one sixth more resolution than NTSC, resulting in better color and sharper resolution.
I guess the race really isn't 'unto the swift'.
It's good to know that we're moving to digital now but also interesting to note that there has been some form of NTSC in use since 1941.
What makes it so hard to change to new technology?

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